Air-pump.



No. 727,816. PATENTED MAY 1903. F. EDWARDS.

AIR PUMP.

APPLIOATION FILED MAY 17. 1902.

NO MODEL.

Zbvlnesse'e, fizz/en (a UNTTE STATES Patented May 5, 1903.

PATENT OFFICE.

FREDERICK EDWARDS, OF LONDON, ENGLAND, ASSIGNOR TO THE EDWARDS AIR PUMP SYNDICATE, LIMITED, OF LONDON, ENGLAND.

Al R- P u M P.

SPECIFIGATION forming part of Letters Patent No. 727,316, dated May 5, 1903.

Application filed May 17, 1902. Serial No. 107,832. (No model.)

To all whom it may concern:

Be it known that I, FREDERICK EDWARDS, asubject of the King of Great Britain and Ireland, residing at London, England, have invented Improvements in Air-Pumps,-of which the following is a specification.

This invention has reference to air-pumps, and more particularly to those of the kind described in the specification of Letters Patent No. 584,306, dated June 8, 1897, when designed for use in pumping air or vapor apart from or with water.

For the purpose of supplying a sufficient quantity of water to the upper side of the bucket to prevent the passage of air or vapor between the bucket and the barrel water is admitted from a suitable source to the chamber around and below the lower part of the barrel, and water thus admitted to said chamber is displaced by the descent of the bucket and guided by the wall of the said chamber is caused to pass directly into the barrel above the bucket, where it serves as an efficient seal, the arrangement being such that water can pass into the said chamber in all positions of the bucket. Conveniently the admission of water to the said chamber is regulated by means of a cock. To enable low pressures to be more easily obtained, the barrel of the pump is constructed with a jacket through which cooling-water flows.

The accompanying drawing illustrates'in vertical section an air-pump of the kind referred to constructed in accordance with this invention.

a is the bucket; b, the barrel; 0, the chamher around and below the lower part of the barrel, which is open to it; (Z, the wall of the said chamber, which gradually proceeds inward and upward toward inlet openings or ports 6 of the barrel and guides the water displaced by the bucket through the openings or ports (2 onto the top of the bucket.

f is a jacket surrounding andformed in one with the barrel Z), and f is another jacket formed in one with and surrounding the chamber 0.

g is the air or vapor inlet.

The two jackets ff communicate by a suitable passage or passages h, which may be made through the wall or walls which separate them. The jacket f has an inlet t' for cooling-water at the top, and the chamber 0 and its jacket f communicate through an external pip j. Which connects the lower part 5 5 of the jacket f and the air or vapor inlet 9 to the pump and is provided with a regulating-cock 7c.

The upper edge of the bucket may be chamfered at Z to increase the depth of the water seal, and the details of construction may be otherwise modified to suit particular requirements.

As will be understood, with this construction liquid can collect in the chamber 0 during the whole of the upstrokes and downstrokes of the bucket, so that by adjusting the cook it according to the speed of the pump the quantity of water passing into the chamber 0 can be regulated so as always to be suf- 7o ficient for sealing purposes. The greater the speed of the pump the more the cook must be opened, so as to enable the same quantity of water to enter the chamber 0 in each of the shorter intervals between the completion of successive downstrokes. Thus a greater volume of cooling-water will also pass through the jackets fandf when the temperature within the barrel is likely to be higher.

What I claim is-- I 1. In an air-pump, the combination ofabarrel, a surrounding jacket, an inlet for water thereto {and an outlet for water therefrom, said outlet leading to the interior of the barrel and being controlled by a cock, as set forth.

2. In an air-pump of the kind referred to, the combination of a barrel having openings or ports in its lower part and a bottom that constitutes around and below the lower part of the barrel a chamber having a guiding-wall that proceeds inward and upward toward the said openings or ports, asurrounding jacket, an inlet for water thereto and'an outlet for water therefrom, said outlet communicating 5 with the chamber beneath the barrel, as set forth.

3. In an air-pump of the kindreferred to, the combination of a barrel having openings or ports in its lower part and a bottom that constitutes around and below the lower part of the barrel a chamber having a guidingthe said openings or ports, a supply of sealing liquid independent of the chamber being exhausted, and means adapted to supply said sealing liquid to the chamber around and beneath the barrel continuously during the working of the pump, as set forth.

Signed at 62 Bishopsgate street Within, in 20 the city of London, this 2d day of May, 1902.

FREDERICK EDWARDS.

Witnesses:

GEORGE WILLIAM HOLE, ARTHUR WOASNAM. 

